Thyrotropin to Free Thyroxine Ratio Measurement

**Semantic type:** Laboratory Procedure

**Definition:** The determination of the ratio of thyrotropin compared to free thyroxine present in a sample. The measurement may be expressed as a ratio or percentage.

**Synonyms:** - THS to Free T4 Ratio Measurement - TSHT4FR - Thyroid Stimulating Hormone/Free T4 - Thyrotropin/Thyroxine, Free - Thyrotropin/Thyroxine, Free